<meta charset="utf-8">
<select>
 <script>
    var shengxiao=["鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"];   
    for(var i=0;i<shengxiao.length;i++){
         document.write("<option>"+shengxiao[i]+"</option>");
    }
 </script>
</select>